Polishing-roll.



A. MCDOWELL, DECD.

l. R. MCDOWELL, ADMINISTRATRIX.

POLISHING HOLL.

APPLICATION FILED APR- 3| i913- ALEXANDER MGDOWELL, F LYNN, MASSACHUSETTS; JEDA R. MCDOWELL, ADMJINIS- TRATRIX 0F ALEXANDER MCDOWELL, DECEASED, ASSIG-NOR -T0 VIENTICNE H. IVIGDOWELL, 0F LYNN, MASSACHUSETTS.

POLISHING-ROLL.

Specification. of Letters Patent.

Patented Feb.. f3, 191W.,

Application filed Apri13, 1913. SeraLNo. 758,725.

y To all whom it may concern Be it known that I, ALEXANDERy McDownm., a citizen of the `United States, and resident of Lynn, in the county of Essex and State of Massachusetts, have yinvented cer tain new and useful improvements in Polishing-Rolls, of which the following is a specification.

rllhis invention" relates to an improved roll adapted for use in the arts for the purpose of giving a polished finish to articles of all sorts. rlFhe purpose of the invention is to provide a new construction of roll whereby the same may be maintained in sufficiently rm condition to do its work properly, without at the same time being made too hard, and in which also the degree lof capacity of yielding of the operating surface may be regulated and adjusted without causing a departure from the true circular form. The precise nature of the roll which lf have devised to have these characteristics is set forth in the following specification, and illustrated in the drawings accompanying` the same. rlFhese drawings show the preferred embodiment of my invention in practical form, without being intended to represent the only possible embodiment or to limit the invention beyond the statement in the broadest of the appended claims.

lfn the accompanying drawings,

Figure l is a perspective view of the roll.-

Fig. 2 is a longitudinal section of the same through the axis.

Fig. 3 is a cross section of the roll and Fig. 4 is an elevation showing the body or core of the roll with the surface layer or facing removed.

Fig. 5 represents a view similar to a pory` tion of `Fig. 2 the outer covering be1ng` omitted.

rllhe same reference characters indicatethe same parts in all the figures.

The roll embodies in its construction a body portion a and a surface element or layer b surrounding the body portion and forming the operating face which acts` diF rectly on the article to be polished. The

body is made preferably of rubber, as thatmaterial for the body, but include within this element of the invention anyother material having the above-mentioned qualities in either greater or less degree than rubber.

lllhis elastic bodyis mounted on a rigid sleeve or tube c which forms the hub of the roll and is adapted to be secured firmly to any .rotatable shaft CZ, in any manner, whether as shown in Fig. 2 or otherwise. Mounted upon the sleeve or tubular hub o are disks or heads e, 7 which are located ad jacent to the opposite end faces of the elastic body and which are confined between abutments g, h on the sleeve, one of which abutments, as L, is adjustable and may be a nut threaded upon the sleeve.A These disks or heads are preferably made convex on the sides toward the elastic body so that when forced together they willr compress the axial portion of the body and expand its peripheral portion radially upward. Between the disks and the body are washers z', adapted to conform to the convex faces of the respective heads and made ofa material which will slide easily onvthe material of the heads.

Without intending to limit myself to the against any twisting and possible tearingv of the l'elastic` body due to the turning of either or both heads which may result when they are forced together by such a rotatable adjuster as the nut h. Where the adjust ment may be produced Without tendency to rotate either head, the washers may be dispensed with.

rThe surface covering 'b of theroll may be of any nature suitable for the work which the roll is designed to perform. It may be of soft and yielding material such as felt, or' it may be a sheet coated with abrasive material. Vhen it is of soft material it is attached to a comparatively firm and inelas tic, but flexible fabric such as cotton duck, a layer of which is indicated in the drawings at 7c. rlhe sheet or strip of such fabric which thus forms the lin-ing and carrierV slipped endwise on and off the body when the latter .is relaxed in consequence of loosening of the binding heads, and when placed on the elastic body 1s clamped by radial outward pressure of such body produced by tightening up the heads. The friction between the surface of the body and the lining 7c, together with vthe positive lock formed g bv the intnrned edges of the seam in the groove of the body, prevents the surface layer from slipping about the body when the latter isfrotated.

` In the peripheral face f the body are a-l series of 'cuts or gashes m which extend diagonally or spirally with relation to the axis of the roll, as indicated in Fig. 4, and extend inward a short distance from the periphery of the body as indicated in Figs. l and 3. These cuts destroy the continuity of the peripheral portion of the elastic body v and thereby perform an important function as hereinafter explained.

It will be understood from the foregoing description that axial pressure of `rthe adjusting heads upon the elastic body will cause the same to expand toward the covering. Distortion of the body is thereby occasioned throughout so much of it as ,remains homogeneous, but the surface layer which is intersected by the cuts m is not homogeneous with the rest ofthe body but is discontinuous. Hence the discontinuous segments between the cuts are left in their natural state when the centraltpart of the body is distorted and are caused to transmit only radial pressure, which is uniform at all points angularly about the axis. The

discontinuity of the peripheral portion pre-v vents any tendency of any part of the body to exert greater pressure than any other part on the covering of the roll and thereby to distort the covering from true circular form. Hence the roll is kept true under all conditions of pressure. The elastic body may be placed under any desired degree of tension so as to take up all slack in the cov;

. ering and expand the latter lsmoothly and give it any desired degree of rmness or softness. At the same time, however great the pressure thus exerted outwardly may be, the covering is never made hard but is able to yield. This is especially valuable where the covering is of felt, which, if placed on an unyielding body or form would quickly become hard packed, but which, when placed on a rubber body of the character described, does not become packed hard although it is suliiciently firm to apply the necessary amount of pressure to polish the article acted upon.

I am aware that other gums and compositions than rubber are soft, yielding, and highly elastic. Consequently, I reserve the right tol use any of such compositions to make the elastic body.

The covering layer may be used without the surface covering b as shown by Fig. 5 andnnay be composed of textile fabric having a frictional surface such as twilled or coarsely woven duck or canvas or corduroy,

erinO of material suitable for olishinof surrounding said body and compression heads mounted on the hub on each side of the body movable axially toward and from one another, whereby to produce radial pressure of the body against the covering.

8. A polishing roll comprising a body portion of rubber or substantially equivalent yielding and elastic material formed with its peripheral part interrupted and discontinnous, a hub contained centrally in said body portion, heads mounted on said hub at oppo-y site ends of the body portion, means for forcing one of said heads toward the other against the body portion, whereby to distort and force the peripheral portion thereof outwardly, and a covering band surrounding and filled by the body portion.

4. A pollshing roll comprising a hub, a

generally cylindrical body portion of rubber, on said hub, a covering consisting of a layer of felt and a lining band of inextensible fabric surrounding the elastic body, said band having a seam with inturned edges interlocked with the body, and compression heads mounted on the hub at opposite ends of the roll adapted to be forced together to compress the elastic body axially and thereby expand its peripheral portion radially, such peripheral portion being discontinuous, whereby the expansive pressure is evenly distributed.

f 5. A polishing roll comprising a generally cylindrical body of elastic material having inclined or diagonal cuts in its periphery, a

hub in the axis of said body, `heads mounted on said hub at opposite ends of the body, anti-friction washers between the heads and the body, a nut threaded upon the hub engaging one of said heads and operable to ad- :Matmata just the latter toward the othei` head", and a polishing covering layer surrounding the elastic body. 'f

6. A polishing'roll comprising Ya hub, a generally cylindrical body portion of rubber, on said hub, a covering consisting of a layer of felt and a lining band of inext'ensible fabric surrounding the elastic body, said band having a seam with inturned edges interlocked with the body, and compression heads mounted on the hub at opposite ends of the roll adapted to lbe forced together to compress the elastic body axially and thereby expand its peripheral portion radially.

7 A polishing roll comprising a hub, a

generally` cylindrical body portion of elastic material, on said hub, a covering consisting of a band of inextensible fabric surrounding the elastic body, said band having a seam with inturned edges interlocked with the body, and compression heads'mounted o the hub at opposite ends of the roll adapted to be forcedl together to compress the elastic body axially and thereby expand its peripheral portion radially, such peripheral portion being discontinuous, whereby the eX- pansive pressure is evenly distributed.

ELA polishing'roll comprising a hub, a

generally cylindrical body portion of elastic material, on said hub, a covering consisting of a band of inextensible fabric surrounding the elastic body, said band having a seam with inturned edges interlocked with the body, and compression heads mounted on the hub at opposite ends of the roll adapted to y be forced P. W. lP'EzzErrr. 

